Grinding machine



March 16, 1937. A. W. WIGGLEsWo-RTH 2,074,303

GRINDING MACHINE Filed Feb. 3, l1956 4 Sheets-Sheet l k 4 iwey- March 16, A 193 7.

A.` w. W'IGGLESWORTH 2,074,308`

GRINDING MACHINE 4 sheets-sheet 2 Filed Feb. 3, 195e March 16, 1937.

A. w. WIGGLESWORTH GRINDING MACHINE Filed Far.A 5, 1936- 4 sheets-sheet s W m J fw,

Mach 16, 1937.

A. W. WIGGLESWORTH GRINDINCL MACHINE Filed Feb. 5, 1956 '4 Sheets-Sheet 4 m.. w .md M u W j Patented Mar. 16, 1937 GRINDING PATENT OFFICE MACHINE Albert W. Wigglesworth, Chicago, VIll., assgnor to Hill-Clarke Machinery C'o., Chicago, Ill., a

corporation of Illinois Application February 3, 1936, Serial No. y62,080

Claims.

This invention relates to machine tools and particularly to vgrinding machines comprising a base, a work carriage longitudinally reciprocable on the base, a headstock including a rotatable 5 work-engaging member, a tailstock, the head and tailstock. being mounted on the workcarriage, a rotatable grindingY wheel, and a grinding wheel base movable transversely of the machine base to position the wheel in proper relation to the work.

I-Ieretofore the rotation of the work-engaging member of the headstock, the longitudinal reciprocation ofthe work carriage and the rotation of the grinding wheel have been produced by three separate motors or by means for conveying power from overhead shafts to the several parts of the machine to be actuated. y

The main object of my invention is to provide improved and simplified means for actuating the moving parts and to eliminate overhead'shafting and to reduce the number of motors heretofore required for operating grinding machines of the character described. i

Another object is to produce rotation of the' grinding wheel and variable speed reciprocation of the workV carriage longitudinally of the base by means ofl one motor located on the grinding Wheel base which is movable transversely of the machine base.

In the construction shown and described herein, the invention is embodied in a grinding machine originally adapted for overhead driving means, but the invention is not limited to this particular embodiment.

In the drawings:

35 Fig. lis afront elevation of a grinding machine embodying my invention.

Fig. 2 is a transverse, vertical sectional view taken on the line 2--2 of Fig. 1, on an enlarged scale, showing part of the machine in side elevation.

Fig; 3 is a rear elevation of part of the machine.

Fig. 4 is a vertical sectional view taken on the line 4-.4 of Fig. 3.

Fig. 5 shows in side elevation a modied form of partof the driving means shown in Fig. 2.

Fig. 6 shows a rear elevation of the parts shown Vin side elevation in Fig. 5.

In that embodiment of my invention shown in thedrawings, the grinding machine comprises a base I0, a work carriage II longitudinally reciprocable'on the base I0, headstock I2 having a rotatable workengaging member I3, and tailstcck I4, said head and tailstocks being adjustably mounted on the work carriage II and movable 55 therewith, Ihe member I3 is rotated by gearing operatively connected with a motor (not shown) located in the housing I5 of the headstock.

The grinding machine also comprises a grinding wheel I6 mountedon a wheel base I'I movable transversely of the base I0, and motor IB also on the wheelbase Il. In this embodiment the transverse movement of the wheel base I1 is produced by actuating a hand wheel I9.

The motor I8 is adjustably secured to the wheel base I'I by bolts1 I8 and has a motor shaft on the extended end of which is mounted a small pulley 2i) and a larger pulley 2|, the latter preferably being of the multi-grooved type as shown. A plurality of belts 22 connect the pulley 2l with a similar pulley 23 on the shaft 24 on which the grinding wheel I6 is mounted. In Fig. 1 the shaft 24 is shown mounted in bearings 25. The motor I8 thus drives the wheel I6 through motor shaft, pulley 2 I, belts 22, pulley 23 Vand'wheel shaft 24.

The means for transmitting power from the motor IB to the work-carriage driving mechanism is best shown in Figs. 2 and 3. A horizontally disposed shaft 26 is rotatably mounted in bearings 21 on the rear wall of the machine, and on one end of `said shaft 26 is xed a wide plain pulley 28. A grooved pulley 29 is also fixed on the shaft 26 inwardly of said pulley 28. A tightener pulley 30 is loosely mounted on the shaft 3l fixed in the arm 32. The arm 32 is pivotally mounted on the shaft 26 by the sleeve 33. A belt 34 connects the 30 pulleys 20 and 29 andengages the tightener pulley On the end wall of the base I0, adjacent the rear of the machine, is pivotally mounted at 35 an arm 36, and extending horizontally from said arm, at Vrighty angles thereto, are pulley shafts 3l, 38, on which are loosely mounted wide idler or tightener pulleys 39, 40. The drive shaft 4I, rotatablyV mount-ed in the forward part of the base I0,is operatively connected to the work car- 40 riage Il through gearing (not shown) for reciprocating the said carriage longitudinally of the base I0. A speed-change pulley 42 fixed on the shaft 4 I is connected to the pulley 28 on the shaft 26-by a be1tf43which extends through an opening 44 in the rear wall ofthe left hand side. of the base IIJ (as-viewed in Fig. 3). The belt 43 is'engagedby the idler pulleys 39 and 40 as best shown irrFig. 2. Variations in speed of rotation of the drive shaft 4I are obtained by moving 50 the belt 43 longitudinally of the pulley 28 and stepped or cone pulley 42.

In Fig. 2y the wheel base I1 is shown in approximately its rearward position. When the wheel base I1 is moved transversely of the base 55 l0, toward the carriage the relative positions of the pulleys 29 and 36 are altered, as indicated by the dotted lines in Fig. 4.

The motor |8 thus drives the shaft 4| at variable speeds for actuating the work carriage the driving connections comprising the motor shaft, pulley 26, belt 34, pulley 29, shaft 26, pulley 28, belt 43, and speed-change pulley 42 on shaft 4|, and at the same time the said motor drives the grinding wheel I6, as heretofore explain-ed.

In Figs. 5 and 6 is shown a modified form of driving means, especially designed for a grinding machine in which the motor 45 is larger than the motor I8 and consequently its pulley 46 (corresponding with pulley 20 of motor I8) is not in alignment with the pulley 41 (corresponding with pulley 29) on shaft 26. It will be understood that said pulleys 2l! and 29, in Figs. 1 to 4, inclusive, and said pulleys 46 and 41, in Figs. 5 and 6, are located in positions which are the best available in an existing machine originally designed to be operated by separate sources of power for the grinding wheel I6 and for the shaft 26 (operatively connected with the carriage-reciprocating means).

In the modified form the pulleys 2| and 23 and belt 22 correspond to the same numbered parts previously described for driving the wheel I6. The shaft 26 and the plain Wide pulley 28 also correspond to the parts similarly numbered in Figs. 1 to 4.

The pulley 46 is connected by a belt 48 with a grooved pulley 49 fixed to the hollow shaft 50.

An arm 5| is pivotally mounted on the shaft 50 and carries at its outer end a tightener pulley 52, which is also engaged by the belt 48. Also keyed to shaft 50 is a pulley 53. The shaft 50 is loosely `mounted on the stub shaft 54 fixed to the base I1. The pulley 53 is connected by belt 55 to the pulley 41, keyed to shaft 26. An arm 56 pivotally mounted on shaft 26 carries a tightener pulley 51 engaged by belt 55.

As the wheel base |1 is moved transversely of the machine, the relative positions of the pulleys 53 and 41 and associated tightener pulley 51 are altered, the pulley 51 automatically adjusting itself to tension the belt 55. The tightener pulley 52 keeps proper tension on the belt 48.

In this form of construction, the motor 45 drives the grinding wheel I6 (through the motor shaft, pulley 2|, belts 22, pulley 23 andwheel shaft 24) and also drives the shaft 4| for actuating the Work carriage at varying speeds, the drive being from motor shaft to pulley 46, belt 48, pulley 49,

shaft 50, pulley 53, belt 55, pulley 41, shaft 26, pulley 28, belt 43 and change speed pulley 42 on shaft 4|.

Transverse movement of the wheel and motor base I1, while the machine is in operation, does .not interfere with the driving connections between said motor and carriage actuating shaft .4|, because the self-adjusting pulleys 30 (Figs.

2, 3 and 4) and 51 (Figs. 5 and 6) automatically r retain driving tension on the belts 34 (Figs. 2,

3 and 4) and 55 (Figs. 5 and 6).

Changes may be made in details of construction without departing from the scope of my invention and I do not intend to be limited to the exact form shown and described, except as set forth in the appended claims.

I claim:-

l. In a grinding machine having a base, a work carriage mounted for longitudinal reciprocation on the base, a wheel base and a rotatable grinding wheel on said wheel base, the wheel base being movable transversely o-f the first mentioned base, means for simultaneously rotating the grinding whe-el and actuating the work carriage from a single source of power, said means comprising a motoi` mounted on said wheel base, its motor shaft operatively connected with the grinding wheel, a pulley on the motor shaft, a horizontally disposed shaft mounted on the machine base, a pulley xed on said shaft, a tightener pulley pivotally mounted on said shaft, a belt connecting said pulleys and engaged by the tightener pulley, a drive shaft mounted in the base and operatively connected with the work carriage, and operative connections between the horizontal shaft and said carriage drive shaft.

2. In a grinding machine having a base, a Work carriage mounted for longitudinal reciprocation on the base, a wheel base and a rotatable grinding wheel on said wheel base, the wheel base being movable transversely of the first mentioned base, means for simultaneously rotating the grinding wheel and actuating the work carriage from a single source of power at variable speeds, said means comprising a motor mounted on said wheel base, its motor shaft operatively connected with the grinding wheel, a pulley on the motor shaft, a horizontally disposed shaft mounted on the machine base, a pulley fixed on said shaft, a tightener pulley pivotally mounted on said shaft, a belt connecting said pulleys and engaged by the tightener pulley, a wide plain pulley fixed on said shaft, a drive shaft mounted in the base and operatively connected with the work carriage, change speed elements on said drive shaft, and a belt connecting said horizontal shaft and carriage drive shaft and movable longitudinally of said plain pulley and said change speed elements.

3. In a grinding machine having a base, al

tioned base, means for simultaneously rotatingv the grinding wheel and actuating the work carriage from a single source of power, said means comprising a motor mounted on said Wheel base,

its motor shaft operatively connected with the y grinding wheel, a pulley on the motor shaft, a4V

stub shaft extending horizontally from the wheel base, a hollow shaft loosely mounted on the stub shaft, a pulley fixed on the hollow shaft, a tightener pulley pivotally mounted on the hollowv shaft, a belt connecting the said pulleys on the motor shaft and hollow shaft and engaged by the tightener pulley, a second pulley on the hollow shaft, a horizontally disposed shaft mounted on the machine base, a pulley fixed on said shaft, a, tightener pulley pivotally mounted on said shaft,l a belt connecting said second pulley on the hollow shaft and the pulley on the horizontal shaft and engaged by the tightener pulley, a drive shaft mounted in the base and operatively con-M nected with the work carriage, and operativev connections between the horizontal shaft and said carriage drive shaft.

4. In a grinding machine having a base, a work carriage mounted for longitudinal reciprocation on the base, a wheel base and a rotatable grinding wheel on said wheel base, the Wheel base being movable transversely of the first mentioned base, means for simultaneously rotating the grinding wheel and actuating the work car,

riage from a single source of power, said means comprising a motor mounted on said wheel base, its motor shaft operatively connected with the grinding wheel, a pulley on the motor shaft, a

horizontally disposed shaft mounted on the ma-l chine base, a pulley fixed on said shaft, a. belt connecting said pulleys, a tightener pulley mounted on a support and engaging said belt, a drive shaft mounted in the base and operatively connected with the Work carriage to move the same longitudinally, and operative connections between the horizontal shaft and said carriage drive shaft, said operative connections comprising a belt connecting said shafts, an arm pivotally mounted on the base and a pair of idler pulleys carried by the arm and bearing on said belt.

5. In a grinding machine having a base, a work carriage mounted for longitudinal reciprocation on the base, a wheel base and a rotatable grinding wheel on said Wheel base, the Wheel base being movable transversely of the first mentioned base, meansr for simultaneously rotating the grinding wheel and actuating the work carriage from a single source of power, said means comprising a motor mounted on said Wheel base, its

a. pulley fixed on the hollow shaft, a tightener pulley pivotally mounted on the hollow shaft, a belt connecting the said pulleys on the motor shaft and hollow shaft and engaged by the tightenerrpulley, a second pulley on the hollow shaft, a horizontally disposed shaft mounted on the machine base, a pulley xed on said shaft, a belt connecting said second pulley on the hollow shaft and the pulley on the horizontal shaft, a tightener p-ulley mounted on a support and engaging said belt, al drive shaft mounted in the base and operatively connected With the work carriage to move the same longitudinally, and operative connections between the horizontal shaft and said carriage drive shaft, said operative connections comprising a belt connecting said shafts, an arm pivotally mounted on the base and a pair of idler pulleys carried by the arm and bearing on said belt.

ALBERT W. WIGGLESWORTH. 

